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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 14    No. 1    February 2004

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Closed-loop control of weld penetration in
keyhole plasma arc welding
CHEN Qiang(陈 强), SUN Zhen-guo(孙振国), SUN Jiu-wen(孙久文) , WANG Yao-wen(王耀文)

Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China

Abstract:To improve the penetrating ability and the welding quality of keyhole plasma arc welding, a novel penetration closed-loop control system was established. In the system, welding current and plasma gas flow rate were selected as adjusting variables. The wavelet method was used to detect penetration status from welding arc voltage in real-time. The control strategy of one-keyhole-per-pulse was adapted to fulfill stable and high quality welding process. Experimental results show that the developed system can apparently increase the penetrating force of plasma arc and keyhole plasma arc welding is realized successfully in stainless steel with 10 mm in thickness. Moreover, the disturbances of gradual change and break change from 3 mm to 6 mm in thickness are come over due to the good response property of the developed system.

 

Key words: plasma arc welding; penetrating force; plasma arc; penetration; closed-loop control

ISSN 1672-7029
CN 43-1423/U

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